General Flame Approach to Chainlike MFe2O4 Spinel (M = Cu, Ni, Co, Zn) Nanoaggregates for Reduction of Nitroaromatic Compounds

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• 作者：Yunfeng Li ; Jianhua Shen ; Yanjie Hu ; Shengjie Qiu ; Guoquan Min ; Zhitang Song ; Zhuo Sun ; Chunzhong Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：54
• 期：40
• 页码：9750-9757
• 全文大小：469K
• ISSN：1520-5045

文摘

Unique chainlike MFe₂O₄ (M = Cu, Ni, Co, and Zn) nanoaggregates (NAs) have been prepared by facile flame spray pyrolysis of nitrates/ethanol precursor. Synthesized MFe₂O₄ are composed of primary nanocrystallites mainly ranging from 8 to 20 nm and show uniform aggregations with size of 200鈥?00 nm. As heterogeneous catalysts, it is clearly noted that CuFe₂O₄ NAs have the highest catalytic activity for the reduction of nitroaromatic compounds compared to NiFe₂O₄, CoFe₂O₄, and ZnFe₂O₄. The highest rate constant of 36.17 min^鈥?路g^鈥? is achieved at a low catalyst usage (10 渭L, 0.2 mg路mL^鈥?). The remarkably enhanced catalytic performance of CuFe₂O₄ NAs is mainly attributed to the promoted electron transfer on Cu²⁺ active sites, which is facilitated by unique spinel structures and chainlike aggregate morphology. It is demonstrated that flame spray pyrolysis technique is an effective route to produce binary or complex oxides for potential industrial use.